D K Sharma
Articles written in Sadhana
Volume 38 Issue 4 August 2013 pp 667-678
Radio frequency and Microwave (RFM) infrastructure test facility is under development at RRCAT for evaluating and powering, subsystems of particle accelerator. As a part of this facility, design of 20–30 kW UHF solid state power ampliﬁers is in progress. For this work, design procedure has been formulated for the development of solid state ampliﬁer modules, radial combiner, divider and directional coupler; with speciﬁcations suited to RFM power system for particle accelerator. Methodology has been demonstrated by developing two different compact ampliﬁers with power output of 2 kW each, operating at 352 MHz and 505.8 MHz, respectively. This paper describes underlying design principles and indigenous development of these ampliﬁers, consisting of 270–300 W ampliﬁer modules, 8-way 2 kW radial combiner/divider and directional couplers. Design methodology for power combiner has been extended by physically realizing higher power (4 kW) 16-way power combiner and 2-way combiner (8 kW) for higher power (8 kW) ampliﬁer conﬁguration planned. Simple design, indigenous technology, high efﬁciency and ease of fabrication, are the main features of this design.